I ran the reamer back and forth on all of them a few times and then cranked the engine. Nice cloud of black carbon particles!

It really makes the (new) glow plugs go back in easily, and should make them more effective without carbon packed around them soaking away their heat.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles